%0 Journal Article
%T Revisiting Fizeaus Observations: Spectral study of Na source using Newtons rings
%A K S Umesh
%A Denny Melkay
%A J Adithya
%A Sai Prem Shaji
%A N Ganesh
%A R Dharmaraj
%A Rajkumar Jain
%A S Nanjundan
%J Physics
%D 2013
%I arXiv
%X Conventional Newtons rings is generally used in undergraduate laboratory to determine the average wavelength of Na doublet. A minor modification of this setup enables us to view simultaneously Newtons rings both in reflected as well as transmitted light. A movable glass plate with respect to the plano-convex lens allows us to observe the variation of contrast/visibility of these fringes and thus allows us to determine the separation of the yellow doublet.
%U http://arxiv.org/abs/1304.7586v1